-65.25% is the change from 800 to 278
Calculation steps:
[( 278 - 800 ) ÷ 800] x 100 = -65.25%
Formula
Percentage change = [(278 - 800) / 800] x 100
Subtract the new number by the original number
278 - 800 = -522
-522 ÷ 800 = -0.6525
-0.6525 x 100 = -65.25%